I installed the NAP QT4000 just before our season started here in NJ and I love it. It did take a bit of fine tuning however: Initially I was rubbing the block and needed to "back up and lower" the unit; I put some mole skin on the shelf as to quiet down the release strike... that worked great- it's silent now; I drilled through the cable slide and installed the rest cable through it for a more secure fit. I hope that this helps, but would be very careful before you sart changing equipment at this time of year....you should wait until March or April to start experimenting.
"Measure twice, shoot once <img src=icon_smile_evil.gif border=0 align=middle>
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